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For this question it is key to remember the indices laws. The ones you need to recall for this question are: x^{a} / x^{b} = x^{a - b}, and (x^{a})^{b} = x^{a * ...}

= We start by halfing the 10 and putting x + 5 in a bracket = (x + 5)^2 = Opening these brackets give us x^2 + 10x + 25 = To make the 25 the same as - 3 we have to minus 28 = Therefore the answer is = ...

dy/dx = 4x - 12 x-coordinate= 5 so sub in 20-12 = 8

First of all there are 3 different methods of working out simultaneous equations: Elimination, Substitution and Graphical. Today I will show the substitution method.If x + y = 4 then rearranging the...

Explain how the ratio shows everyone's share of the £7200: 1:2:5 (Jay's share:Sheila's Share:Harry's Share)Add up the terms of the ratio to find out many equal parts...